Molding machine



Jan. 18 1927.

w. H. NlcHoLLs www@ HOLDING MACHINE Filed June 24, 1924 -4; Sheets-Sheetl Fgz Q ATTORNEY Jan' 18, 1927 w. H. NlcHoLLs MOLDING MACHINE Filed June24, 1924 4 Sheets-Sheet 2 SL.; TYOR NEY if r - Y1,614,966 Jan 18, w. HaNICHOLLS MOLDING MACHINE INVENTOR A'I'I'ORNEYJJ` Jan. 18, 1927.1,514,966

w. H. NICHOLLS HOLDING MACHINE Filed June 24, 1924 4 Sheets-Sheet 4 om sno m T. N N R w o WN m H. m In a n z m 2 W 0 a2 7 lllllvl a :lhnlllllmlili. M7 VV/M w a n ./l!2 T y w q E g 6 0 i, M 3 a d 2 Patented Jan. 18,1927.

uurrlszoI STATES WILLIAM n. NIcHoLLs, or nnOoIILIrN,` NEW Yonx.

HOLDING MACHINE.

.Application led J'une 2,4,

',lhis invention relates to improvements in that type of machine shownin Patents No. 1,277,745, dated September 3, 1918 and 1,472,807 datedNovember t3, 1923.

ln a molding machine embodying this invention and constructed asillustrated and described herein, the sand may be mechanif cally joltedto tightly pack it in a flask aroumla pattern, the flask and the patternbeingy so. supported that after the jolting operation they may be rolledoverand the mold then squeezed. After the squeezing operation thepattern is supported above the flask and the flask may then be loweredto withdraw the pattern. As the flask is lowered it is automatic illylifted lfrom the jolting and squeezing means by a conveyor, so that itmay be readily rolled along the conveyor out of the machine.

lt is necessary that the pattern be at the bottom ot' the flask duringthe jolting operation in order that the sand may be firmly packed aboutit. In the twol patents hereinbefore mentioned the patterns are drawndown'from the flask. This, in many instances, requires that the moldshall be turned over by hand after the patterns have been withdrawn and`after the lnold has been removed from the machine. lVith some formsvofpatterns this turning over of the mold after the pattern has beenwithdrawn is dangerous to the mold, that is to say, it is apt to resultin the breaking down of the parts of the mold. This is particularly soin the large patterns and heavy molds.' It' is desirable therefore toprovide a simple and eflicient means by which the mold may be rolledovervafter the jolting operation and before the squeezing operation sothat it may be squeezed in a position reverse to the lposition it was induring the jolting operation. It is also desirable to provide meanswhereby after the squeezing operation the flask may be lowered and thepattern plate supported in its elevated position. This results in themold being completed and inl position to be taken out of the machineright side up for the rpouring operation. By rolling over the mold inthe machine and before the squeezing operation all danger of 'injury tothe inold is avoided.

It is also desirable, and particularly in Ymaking heavy molds, toprovide means for I automatically lifting the mold from the jolting andsqueezing meansand permitting 1t 1924. serial No. 722,103.

to be moved out of the machine without bodily and manually lifting itfrom the squeezing mechanism. This alsoavoids inlury to the molds vandincreases the speed of operation and reduces the amount of manual labornecessary in the operation.

I wish it understood that I amvnot to be limited tothe construction ofmachine Aillustrated herein for the reason that the invention is capableof many modifications and may be applied to machines differingmaterially in construction from the machine illustrated in the drawingsand described herein.

In the drawings, Fig. l is a side elevation partly in section of amolding machine constructed in accordance with this invention;

Fig. 2 a front elevation partly in section taken on the line 2 2 of Fig.1;

Fig. 3 a plan view of the machine;

Fig. l a sectional View n the linel 4-4 of'Fig. 3;

Fig. 5 a detail perspective view of one of the conveyor bars;

Fig. 6 a Side elevation partly in section of the rotatable patternholding head;

Fig. 7 a plan view of the pattern holding head.;

Fig. 8 an lend elevation of the pattern holding head;

Fig. 9' a front elevation showing the mold in transverse section withthe pattern holding head rolled over and in position' for the squeezingoperation; A

Fig. 10 a view similar to Fig. 9 4illustrating the squeezing operation;and

Fig. 11 a view similar to Figs. 9 and 10 illustrating the patternwithdrawing operal Referring to the various parts by numerals, 1designates-the base of the machine, saidl base being provided withoppositely extending rigid arms or brackets 2 and 3. The base is formedwith a central vertical cylinder 4 which is open at its upper end andclosed at its lower end by a horizontal wall 5. In the arm 2 is rigidlymounted an upstanding post 6 on the upper end of which is rotatablymounted a horizontally swinging frame arm 7 The frame arm 7 carries theupper pressure head 8 which is connected to said arm by screw 9 threadedthrough a suitable bushing mounted in the arm. The pressure head is sopositioned on the arm that it may be brought directly over the center ofthe cylinder 4 for the squeezing operation, as will be hereinafterdescribed. In the free end of the frame arm is formed a verticallydisposed jaw which is adapt- `ed to engage and to receive the upper endof over the center of the cylinder 4. The pressure head 8 carries on itslower face a magnet-ic head`12 which may be connected to a suitablesource of eletrlc current by means of the connection plug 13. Themagnetic head 12 forms the lower face of the pressure head 8 and may bemagnetized by closing a switch in the electric circuit, the switch beingconveniently located for manipulation by the operator. The upper end 'ofthe rod 11 is provided with a collar in the form ot' an adjustable nutwhich is adapted to engage the upper end of the jaw 10 and to take the11p-thrust on the pressure head during the squeezing operation. The arm.7 carrying the pressure head may be readily swung rearwardly away fromthe moldlng machine whenever desired, as illustrated in Fig. 3.

In the cylinder 4 is fitted a large squeezepiston 14 which' is closed atits lower end and open at its upperend. The u ward movement of thesqueeze-piston ishmited by the headed )bolts 15 which are rigidlymounted in the bottom wall 5 of the cylinder and extend upwardly throughapertures in the bottom wall of'vthe piston, as shown clearly in Fig. 1.A small vertically arranged cylinder 16 is formed at the center of thesqueeze-piston, the upper end of this cylinder being open and the lowerend thereof being formed by the bottom wall of the squeeze-piston. Ashort distance above the bottom of this cylinder 16 is formed an exhaustport 17 which places the said small cylinder in communication with theinterior of the larger portion ot the squeezelston and thence toatmosphere. Mounted 1n the smaller cylinder 16 is a hollow jolt piston18. This piston is open at its lower end and is provided with a crosswall 19 a short distance upwardly from its lower end. EX- tendingthrough this cross wall is an air supply pipe 20 which leads out throughthe upper end of said piston to an air control valve 21 mounted on therigid arm 3 of the base. An air supply pipe 22 leads from the valve 21through the bottom wall 5 to supply air under the squeeze-piston 14. Thecontrol valve 21 is of the usual, or of any suitable. construction andis4 adapted to be4 operated by the handle 23. Formed integrally lwith.the upper end of the -jolt piston is a jolt and squeeze head 24. Thelower end offthis head is adapted to rest on the upper end of thesqueeze-pistou, as shown clearly in Fig. 1.

cular vertically arranged flange 38.

A vertically arranged air cylinder 25 is rigidly connected to the rigidbracket 2. As shown in Fig. 2 this cylinder is formed integrally withthe bracket, but of course it may be secured thereto in any suitablemanner. llhis cylinder is arranged close to the vertical post 6 and isparallel therewith. ln the cylinder 25 is arranged a piston 26 carryingan upwardly extending piston rod V2T which projects through the -capclosing the "It upper end ot the said cylinder. Slidably mounted von thepost 6 is a long sleeve 28 which is provided at its lower end with alaterally extending foot 2S). The upper end of the pistou rod 27 isrigidly connected to eo the foot 2S) so that the sleeve 28 will be movedup and down on the post 6 in response to the movements of the piston 26.'lhe sleeve 28, when in its lowerniost position, rests on the uppersurface of the bracket 2, said bracket forming a rigid stop and rest forthe sleeve. ln the lowermost position of the sleeve 28the piston 26 isat the bottoni of the cylinder. An air valve 3U is connected by a pipe31 to the bottom of the cylinder @il 25 so that by properly manipulatingthe valve air will be admitted under the piston 26. This valve may be ofany suitable construction and it is thought unnecessary to illustrate itin detail. The valve is adapted 05 to be operated by means of the handle32. Mounted on the sleeve 28 is a vertically inovable and horizontallyrotatable support 33. This support is adapted to engage a shoulder34formed near the bottom of the sleeve l0@ 28. When the sleeve 28 is movedupwardly the shoulder 34 will engage the lower end of the support 33 andcarry said support upwardly with it. Formed on one side of the support33 is a tapered tubular bearingI 35, 105 the axial center of saidbearing being horizontal. In this tubular bearing is mounted ahorizontal journal 36 of a pattern holding .head 37. The patternholdinghead is substantially rectangular in form and is provided at its outerside, that is to say the side nearest the vertical post 6, with a largecir- The journal 36 extends outwardly from the center of this flange,and it is tapered to iit within the tapered bearing 35. Suitable ballbearings support the journal. The pattern holding head 37 is connectedto the flange 38 near the-lower margin thereof, the upper horizontalpattern holding surface 39 being 12@ considerably below the axial centerof the Harige 38 and the journal 36. The flange 38, at diametricallyopposite points in a horizontal plane, is provided with two latchreceiving sockets 40. The bearing 35 is 195 formed with a horizontaltubular extension 41 adapted to receive a -spring pressed latch bolt 42.the spring tending to force the latch inwardly into engagement witlisockets 40. The outer end of thelatch bolt 42 is con- 130 `flask overthe pattern.

nected to a horizontally swinging lever. 43 pivoted to the bearing Q35.The latchv bolt ser-ves to lock the pattern supporting head inhorizontal position, as will be hereinafter described. The pattern plate44 is rigidly secured to the surfacef) of the pattern supporting head byscrews or other suitable fastening means, passing through the patternplate and into threaded sockets 45 in the pattern holding head. 'lhepattern plate is provided with the usual laterally extending lugs 46carrying upstanding centering pins 47 which are vadapted .to passthrough apertured lugs formed on the flask to properly center the flaskwith respect to the pattern plate. The pattern supporting head may beswung Ahorizontally on the post 6 to move it away from the jolting andsqueezing mechanism, as shown in Fig. 'lhis head is also rotatable onthe horizontal journal 36 for the purpose of inverting the patternholding head; and the latch bolt 42 is adapted to lock the patternholding head in horizontal position either above or below the horizontalaxis of the journal 36. When the pattern holding head is in its normallower position it is adapted to rest directly7 on the jolting andsqueezing piston head 24. In'this-position of the pattern holding headthe lower end of' the support 33 is a short dist-ance above the shoulder34 of the sleeve 2S so that in the jolting operation the said supportwill not engage the shoulder 34. As shown in the drawings the patternholding head is formed with a flat bottom to engage the magnetic headwhen the mold is rolled over, but of course it may be of' any suitableform. The flask 48 is formed with perforated lugs 49 adapted to fit downover the centering pins 47 carried by the pattern plate to center thevThe base of the machine, at diametrically opposite points, is forme-dwith two verticallv arranged sockets 50, said sockets extending theentire depth of the base. Rigidly secured to the jolting and squeezingpiston head 24 are two depending guide plungers `5l which are fittedsnugly in the sockets 5() to accurately guide the head 24 in its up anddown movement. Secured rigidly to the upper surface of the base of themachine are two rails 52, said rails extendin fore and aft of themachine, one on each side of the head 24. Each rail is formed withupsta-nding lugs in which are journalled rollers 53, said rollers beingon the inner side ot the rails, that is to say on the sides nearer thecenter of the head 24. The rollers are so arranged'that the forward onesare slightly higher than the 'rear ones, all of said rollers comprisinga rolle-r conveyor which inclines slightly rearwardly and downwardly.The rollers are so located thatl their upper margins are above the uppersurface of the head 24, but' are below the pattern receiving surface 39when the pattern supporting head is restin on the jolting and squeezinghead 24. At tie rear of the machine is preferably arranged a. rollerconveyor 54 onto which the molds may be moved from the rollers 53, aswill he hereinafter described.

The operation nt the machine may be.

briefly described as follows:

The. flask is placed in position on the pattern plate and the patternplate holding head is brought to rest on the head 24. ',Ihc flask isthenfilled with sand and the valve operated to admit air through thepipe 20 for the purpose of vibrating the jolting piston 16 and theconnected head 24. During this jolting operation the pattern supportinghead is vibl'ated, the support 33 moving up and down on the sleeve 28.After the jolting operation the flask is filled smoothly with sand andthe presser board 55 placed in position in the flask, as shown inFig. 1. 'lh'e presser board is temporarily clamped in position by meansof' the clamps 56 which engage the edges of the presser board and theedges of the pattern plate. The presser board is considerably wider thanthe flask for a purpose which will be hereinafterdcscribed. After thepresser board has been secured in position the valve 30 is operated toadmit air below the piston 26 to thereby elevate the sleeve 28 on thepost 6. As the sleeve 28`moves upwardly the shoulder 34` lpicks up thesupport 33 and thereafter the pattern holding head and the flask moveupwardly with the 'sleeve 28. Vhen the flask has been sufficientlyelevated the entire flask support may be swung around laterally on thepost 6, if desired, or if the flask is not too high it may be allowed toremain in position directly over the jolting and squeezing mechanism.lVhen the pattern supporting head is in the desired elevated positionthel latch bolt 42 is released from the flange of the patternsupportinghead whereupon the said head and the flask will roll over, that is tosay will reverse their positions. This roll over operacion will bepractically auto'- matic because the greater. portion of the 4 weight ofthe flask will be above the horizontal axial `line of the journal 36 sothat it will be necessary for the operator merely to upset thebalance'of the flask after the latch 4 2 has been released. The latch 42will then engage the other socket in the flange 38 and thereby lock thepat-tern holding head in its rolled over position and maintain ithorizontal. When the flask and the pattern holding head have been thusrolled over and locked more air is admitted into the cylinderl 25 tocomplete the upward movement of'the piston 26 and the sleeve 28., Acollar 57 is Vrigidly secured to the pos.` .6 to limit the patternholding head is slightly below the magnetic face 12 of the upperpressurey head 8. This is for the purpose of preventing the patternholding head being forced against the magnetic head through theoperation of the lit'ting piston 26. lVhen the sleeve 28 has reached thelimit ot its upward movement air pressure is maintained in the cylinderS25 to hold the tiask and the pattern holding head .in their elevatedpositions. 'lhe valve 2l is now operated to admit air below the squeezepiston, thereby forcing upwardly the jolt and squeeze head 24. andbringing said head into engagement with the presser board 55, as shownin Fig. 10. 'lhe upward movement ot the squeeze piston causes thesupport 83 to move upwardly on the sleeve 28 and brings the patternsupporting head into direct engagement with the magnetic head 12. rlheoperator then closes thel switch to complete the electric .circuitthrough the magnetic head thereby magnetically clamping the patternholding head to the upper presser head. rlhe pattern holding head is, ofcourse, made of suitable metal so that it will be securely magneticallyclamped and supported. It is, of course obviousthatwhen the pressingoperation begins the temporary clamps 56 will drop away from the presserboard and the pattern plate.

After the roll over operation -the pattern plate and the pattern holdinghead are reversed with respect to their positions during the joltingoperation andthe liask is in position to be lowered away from thepattern plate. To draw the 'flask downwardly away from the pattern thevalve 21 is operated to releaseair from below the squeeze piston 14.This permits the flask and the completed mold to draw away from thepattern,the pattern holding head and the pattern being held in theirelevated positions by the magnetic head. As the squeeze piston and thejolting and squeezing head 24 approach the limit of their downwardmovement the presser board 55 comes into contact with the rollers 53 sothat the flask with the presser board therein is deposited on theinclined conveyor. the head 24 moving down below said rollers -andleaving the mold on the rollers. As the series of rollers inclineslightly toward the rear of the machine the mold may be readily movedrearwardly from the machine and on to the Conveyor 54.

After the drawing operation is complete the, current is cut ol from thema netic head and the pattern supporting hea will drop until the loweredge of the-support 3? engages the shoulder 34 of the sleeve 28. Thevalve 30 may then be operated to exhaust air from the cylinder 25 tothereby iermit the sleeve 28 and the pattern holdmg head to recede. As,the head is moving downwardly the latch bolt 42 is released from theangev38 and the pattern holding head will then automatically roll overto its normal position. lVhen it has reached its lower horizontalposition the latch bolt 4Q again engages one of the sockets in flange 36and locks the holding head in position to receive another flask. 'lhepattern holding head will automatically roll over upony the release ot'the latch 42 because the weight thereof is above the horizontal axialline ol the journal 36.

The upper pressure head 8 and the arm T may be swung laterally out otthe Way of the flask during the roll over operation or during the o)eration ot moving the completed mold rom the machine. lt will, ol'course, be swung back into locked position before the squeezingoperation. 'l`he pattern holding head may be swung ,laterally at anytime for the convenient manipulation ot' the machine. 1t may be swunglaterally for convenience in placing a flask thereon or tor the rollover operation.

What I claim is:

1. In a molding machine the combination of a support, a large squeezepiston mounted in said support, a smaller jolt piston mounted centrallyin the squeeze piston, a valve for controlling a supply of fluid underpressure to said pistons, a head carried by the upper end ot' the joltpiston and adapted to bear on the upper end of the squeeze piston, alpattern plate holding head adapted to rest on the head of the joltpiston, vertically movable means for supporting the pattern late holdinghead independently of the joltingand squeezing pistons, means rotatablysupporting the pattern plate holding head to permit it to be rotatedabout a horizontal axis to invert said head, means for raising thepattern holding head independently of the jo ting and squeezing pistons,and means for holding the pattern plate holding head in elevatedposition after it has been inverted by rotating it on its horizontalaxis.

In a molding machine the combination` of a support, a mold squeezingmeans carried by said support, a pattern plate holding head adapted torest on the mold squeezing means, vertically movable means forsupporting the pattern plate holding head independently of the squeezingmeans, means rotatably supporting the pattern plate holding head topermit it to be rotated about a horizontal axis to invert said head,means for raising the pattern plate holding head independently of thesqueezing means. and means for holding the pattern plate holding head inelevated positionafter it has been inverted by rotating it on itshorizontal axis.

3. In a molding machine the combination of a support, a mold jolting andsqueezing means carried by said support, a pattern liti late

plate holding head adapted to rest on the` mold jolting and squeezingmeans, vertically lll plate holding head in ependently of the squeezingmeans, means rotatably supporting the pattern (plate holding head topermitY it to be rotate about a horizontal axis to invert said head,means for raising the pattern plate holding head independently of the)oltng and squeezing means, and means for holding the pattern plateholding head in elevated position after it has been inverted by rotatingit on its horizontal axis.

4. In a molding machine the combination of a support, a large squeezepiston mounted in said support, a smaller jolt piston mounted centrallyin the squeeze piston, a valve for controlling a supply of fluid underpressure to said pistons, a head carried by the upper end of the joltpiston and adapted to bear on the upper end of the squeeze piston,

,a pattern lplate holding head adapted to rest on the head of the joltpiston', vertically movable means for supporting the pattern plateholding .head independently of the )olting and squeezing pistons, meansrotatably supporting the pattern plate holding head to permit it to berotated about a horizontal axis to invert said head, means for raisingthe pattern plate holding head independently of the jolting andsqueezing pistons, and magnetic means for holding the pattern plateholding head in elevated positionafter it has been inverted by rotatingit on-its horizontal axis.

5. In a molding machine the combination of a support, a mold squeezingmeans carried by said support, a pattern plate holding head adapted torest on the mold squeezing means, vertically movable means forsupporting the pattern plate holding head independently of the squeezingmeans,'means rotatably supporting the pattern plate holding head topermit it to be rotated about a horizontal axis to invert said head,means for raising the pattern plateholding head independently of thesqueezing means, and magnetic means for holding the pattern plateholding head in elevated position after it has been inverted 'byrotating it on its horizontal axis.

6. In a molding machine the combination of a support. a mold jolting andsqueezing means carried by said support, a patternplate holding headadapted to rest on the mold jolting and squeezing means, verticallymovable mea-ns for supporting the pattern plate holding headindependently of the squeezing means, means rotatably supporting thepattern plate holding head to permit it to be rotated about a horizontalaxis to invert said head, means for raising the pattern plate holdinghead independently of the Jolting and squeezing means, and magneticmeans for holding the pattern plate holding head in elevated positionafter it has been 'rotatably supporting the head adapte to rest on themold s ueezingv means, vertically movable means or supportin the patternplate holding headindepen ently of the squeezing means, means atternplate holding head to permit it to be rotated about a horizontal axis toinvert said head, means for raising the pattern plate holding headindependently of the squeezing means, an upper pressure'head ada ted tobe engaged by ythepattern plate hol ing head after the said head hasbeen inverted, and means for holding the pattern late holding head inengagement with sai ulpdper pressure head 1n ependently of the mosqueezing means. 8. In a molding machine the combination of a support, amold squeezing means carried by said support, a pattern late holdinghead adapted to rest on the mold squeezing means, vertically movablemeans for supporting the pattern. plate holding head independently `oforizontal gagement with said upper pressure head independently of themold squeezing means.

9. In a molding machine the combination of a base, a mold squeezingmeans carried by said base, a pattern plate holding head adapted to reston the mold squeezing means, vertically movable means for supporting thepattern plate holding head independently of the squeezing means, meansrotatably supporting the pattern plate holding head to permit it to berotated about a vertical axis to'move said head away from the squeezingmeans, and mea-ns rotatably supporting the pattern plate holding head topermit it to be rotated about a horizontal axis to invert said head.

l. In a molding machine the combination of a base, a mold squeezingmeans oarried by said base, a pattern plateyholding head adapted to restonthe mold squeezing means, vertically movable means or supporting thepattern plate holding head independently of the squeezing means, meansrotatably supporting the pattern plate holding head to permit it to berotated about a. vertical axis to move' said head away from thesqueezing means, means rotatably supporting the pattern .plate holdinghead to permit it to be rotated about a horizontal axis to invert saidhead, and an upper pressure head adapted to be engaged by the invertedpattern plate holding head during the mold squeezing operation.

11. In a molding machine the combination of a base, a mold squeezingmeans carried by said base, a pattern plate holding head adapted to reston the mold squeeze means, yertically movable means for supporting thepattern plate holding head independently of the squeezing means, meansrotatably supporting the pattern plate holding head to permit it to berotated about a horizontal axis to invert said head, and an upperpressure head adapted to be engaged by the inverted pattern plateholding head during the mold squeezing operation.

12. In a molding machine the combination of a support, a mold squeezingrmeans carried by said support, a pattern plate holding head adapted torest on the mold squeezing means, vertically movable means forsupporting the pattern plate holding head independently of the squeezingmeans, means rotatably supporting the pattern plate holding head topermit it to be rotated about a horizontal axis to invert said head,pneumatic means for raising thel pattern plate holding headindependently of the squeezing means, and means for holding the patternplate holding head in elevated position after it has been inverted.

13. In a molding machine the combination of a base, a mold squeezingmeans carried by said base, a pattern plate holding head adapted to reston the mold squeeze means, vertically movable means for supporting thepattern'plate holding head independently of the squeezing means, meansrotatably supporting the pattern plate holding head to permit it to berotated about a horizontal carrier about a horizontal axis, means forllocking the support to the carrier in upright and inverted positions, anupper pressureresisting head held at a fixed level during mold-formingoperations, means for guiding the carrier to move vertically, meansadapted to loosely engage the carrier to move the support toward andfrom a position adjacent the under face of said upper head, a verticallyreciprocable mold jarrlng and squeezing head under-'the upper head,

means for vibrating 'said vertically reciprocable head up and down withsaid support seated'in upright position thereon, means for giving saidvertically reciprocable head an extended upward mold-squeezing move.-ment While said carrier is in elevated posi.- tion with the supportinverted and subsequently lowering said head independently ot' thesupport to withdraw a squeezed mold While the pattern plate is heldelevated.

15. In a molding machine, the combination of a roll-overy pattern-platesupport, a vertically reeipro'cable carrier for said support, meanspivotally holding said support to said carrier to rotate relativelytothe carrier about a horizontal axis, means for locking the support tothe carrier in upright and inverted positions, an upperpressureresisting head held at a fixed level during mold-formingoperations, means for guiding the carrier to move vertically, meansadapted to loosely engage the carrier to move the support toward andfrom a position adjacent the under face of said upper head, a verticallyreciprocable mold jarring and squeezing head under the upper head, meansfor -vibrating said vertically reciproeable head up and down with saidsupport seated in upright position thereon, means for giving saidvertically reciprocable head an extended upward mold-squeezing movementWhile said carrier is in elevated position with the support inverted andsubsequently lowering 'said head independently of the support toWithdraw a squeezed mold While the pattern plate is held elevated, andmanually-controlled magnetic .means carried by the upper head fortemporarily holding the support to the headv during drawing of a mold. i

16. In a molding machine the combination of a base, a mold squeezingmeans car- 'ricd by said base, a pattern plate holding head adapted to.rest on the mold squeezey means, vertically movable means for supportingthe pattern plate holding head independent-ly of the squeezing means,means rotatably supporting the pattern plate holding head to permit itto be rotated about al horizontal axis to invert said head, means forlocking the pattern plate holding head in its normal horizontal positionand in its inverted position, and an upper ressure head adapted to beengaged by the inverted pattern plate holding head during the'moldsqueezing operation.

17. In a molding-machine the combination of a support, a mold squeezingmeans carried by said support, a pattern plate holding head adapted torest on the mold squeezing means, vertically movable means forsupporting the pattern plate ,holding head independently of thesqueezing means, means rotatably supporting the pattern plate holdinghead to permit it to be rotated about a -horizontal axis to invert saidhead, means for raising the pattern plate holding head independently ofthe squeezing means, means for holding the pattern plate holding head inelevated position after it has been inverted by rotating it on itshorizontal axis thereby to permit the flask to be lowered away from thepattern plate by the squeezing means, and a conveyor to receive theflask and support it as the squeezing means returns to its normal lowerposition.

18. In a molding machine, an upper head held in a lixed horizontalplane, a vertically reciprocable mold-squeezing and flask-lowering head,a ask-elevating and inverting head, a pattern plate secured to saidlastmentioned head, a vertically shiftable carrier for saidflask-elevating and inverting head, means pivotally holding saidflaskelevatng and inverting head to said carrier to rotate about, ahorizontal axis, means for raising and lowering said carrier at will,and independently operable means for raising and lowering saidmold-squeezing and flask-lowering head while said invertible head is inelevated and inverted position.

li). ln a .molding machine the combination ol a support, a moldsqueezing means carried by said support, a pattern plate holding headadapted to rest on the mold squeezing means, a vertical post, avertically movable sleeve mounted on said post, an air cylinder parallelwith the said post, a piston in said cylinder carrying a piston rodrigidly connectedto said sleeve, a valve for admitting air to said aircylinder and exhausting it therefrom, means to limit the upward movementof vsaid sleeve, a support rotatable and vertically slidable on saidsleeve, a horizontal journal formed on the pattern plate holding headand mounted in a bearing formed in said rotatable and slidable support`an upperv pressure head, means for locking the. pattern plate holdinghead in its normal horizontal position and in its inverted position, andmeans for holding the pattern plate holding head to the upper pressurehead after the said head has been inverted by rotating it on :itshorizontal axis.

20. In a molding machine the combina-` tion ot a support, a moldsqueezing means carried bysaid support, a pattern plate holding headadapted to rest on the mold squeezing means, a vertical p ost, avertically movable. sleeve mounted on said post, an air cylinderparallel withthe said post, a piston in said cylinder carrying a pistonrod .rigidly connected to said sleeve, a valve for admitting andexhausting air from said air cylinder, means to limit the upwardmovement of said sleeve, a support rotatable vand vertically slidable onsaid sleeve, a horizontal journal formed on the pattern plate holdinghead and mounted in a bearing formed in said rotatable and slidablesupport, an upper pressure head, means for locking the pattern plateholding he'ad in its normal horizontal position and in itsinverted'position, and magnetic means for holding the pattern plate'holding head to the upper pressure head after said head has beeninverted by rotatingr it on its horizontal axis.

21.. In a molding machine the combination of a support, a verticallymovable mold squeezing means carried by said support, a pattern plateholding head adapted to rezst on the squeezing means, means rotatablysupporting the pattern plate holding head to permit it to be rotatedabout a horizontal axis to invert said head, means for holding thepattern plate holding head in elevated position after it. has beeninverted by rotating it on its horizontal axis, thereby to permittheflask to be lowered away from the pattern plate by the squeezing means,and means to receive and support the mold flask above the squeezingmeans as said squeezing means returns to its normal lower position.

22. .In a molding machine the combination ot' a support, a verticallymovable mold squeezing means, and means to receive and i support themold flask above the squeezing means as said squeezing means returns toit: normal lower posit-ion, said flask supporting means being inclinedand including antifriction elements adapted to facilitate the lateralremoval of the fiask from the machine.

23. In a molding machine the combination of a support, a verticallymovable mold squeezing means carried by said support, a pattern plateholding headadapted to rest on the squeezing means, means rotatablysupporting the pattern plate holding head to permit it to be rotatedabout a horizontal axis to invert said head, means for holdinglr thepattern plate holding head in elevated position after it has beeninverted by rotating it on its horizontal axis, thereby to permit theflask to be lowered away from the pattern plate by the squeezing means,and means to Areceive and support the mold flask means returns to itsnormal lower position,

lsaid flask supporting means including antifriction elements adapted -tofacilitate the' lateral removal of the flask from the machine. v

24. In a molding machine, an elevated squeezing head, means formagnetizing and delnagnetizing said elevated head at will, a metallicroll-over head, a pattern plate carried by said roll-over head, meansfor raising and lowering said roll-over head, a vertically reciprocablelower head, means for jarring said lower head, and means for impartingan extended up and down motion to said lower head.

25. In a molding'machine, a mold jarring head, a roll-over head vhavingone face adapted to seat on the jarring head, a pattern plate held tothe other face of the roll-over head, a freely vertically slidablecarrier for the roll-over head, raising and lowering means adapted toloosely engage said Carrier, means for limiting upward movement of theCarrier, an upper head, means'holding said head at a fixed level overthe jarring head slightly above the limit of movement of the roll-overhead when inverted, means for rapidly vibrating the jarring head up anddown with the roll-over head seated thereon, means for first elevatingthe jarring head while the roll-over head is in its uppermost invertedposition to force said roll-over head upward against the upper head andsqueeze a mold suspended from the roll-over headV and then lowering thejarring head to normal position, and manually controlled means forholding the inverted roll-over head to the upper head during lowering ofthe jarring head for drawinga mold downward from the pattern plate andsubsequently releasing the roll-over head to permit lowering of saidroll-over head' upon a downward movement of the carrier elevating 'andlowering means.

26. In a molding machine, a base, a vertical post held to the base, ahorizontally swinging arm held to the upper end of said post, apressure. head suspended from said arm, a jolt and squeezehead'supported on the base, means for imparting jolting and squeezingmovements to said jolt and squeeze head, fixed means on said basecooperating with Vsaid arm to arrest movement. of the arm in onedirection with said depending head over the jolt and squeeze head, arollover head having a pattern-plate supporting face and an oppositeface adapted to seat against either said suspended head or said vjoltand squeeze head, a carrier for the -allover head freely slidable onsaid post, vertically reciproeable means mounted on the base adapted toloosely engage under a part of said carrier and move the carrier alongthe post, and a singlehorizontal stub-shaft connection between saidcarrier and the rollover head.

27. In a molding machine, a base, a vertical post held to the base, ahorizontally swinging arm held to the upper end of said post, a pressurehead suspended4 from said arm, a jolt and squeeze head supported on thebase, means for imparting jolting and squeezing movements to said joltand squeeze head, fixed means on said base cooperating with said arm toarrest movement of the arm in one direction with said depending headover the jolt and squeeze head, a roll-over head having a pattern-platesupporting face and an opposite face adapted to seat against either saidsuspended head or said jolt and squeeze head. a carrier for theroll-over head freely slidable on and rotatable about said post`vertically reciprocablel means mounted on the hase arranged to looselyengage under a part of the carrier and move the carrier along the post,and a single horizontal stubshaftconnection between said carrier androll-over head.

28. In a roll-over molding machine, a vertical guide post, a sleeveslidably mounted on the post,'a roll-over head having a verticalextension at one side thereof, and a horizontal stub-shaft connectionbetween said sleeve and said extension.

In testimony whereof I hereunto affix my signature.

WILLIAM H. NICI-IOLLS.

'lila

